These M5’s never make the quoted figures when they are strapped into the rolling road. We have tuned many of these over the years and they all seem to make around 450BHP. This one followed suit.
Before tuning it ran 455BHP / 335LBFT.
After we had tuned it, it achieved 479BHP / 354LBFT.
Whilst the peak numbers (even tuned) are lower than quoted from the factory for these cars. One of the most important factors to look at in the numbers is the delta gains before and after it was tuned. These were +24BHP / +19LBFT!
SM Tuning – www.smtuning.co.uk
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